EP 0233548 B1 19920715 - METHOD AND APPARATUS FOR REGULATING THE INJECTION MOULDING PROCESS
Title (en)
METHOD AND APPARATUS FOR REGULATING THE INJECTION MOULDING PROCESS
Publication
Application
Priority
- DD 28703586 A 19860214
- DD 29118186 A 19860611
Abstract (en)
[origin: EP0233548A2] The invention relates to closed-loop or open-loop control and/or monitoring of the operation of hydraulic injection-moulding machines, the throughput being reduced for switching over from injection to follow-up pressure. The object of the invention is to find the injection stroke, injection time, injection pressure or injection rate which corresponds to the optimum switching point, to control process parameters and to achieve cavity filling which is mould-independent, machine-internal, free from pressure peaks and complete. According to the invention, the time is recorded between the switching point of the throughput reduction and the reaching of a preselected pressure or the pressure upon throughput reduction, or of a signal in relation thereto, or the time between the reaching of a preselected pressure before throughput reduction and reaching it for the second time, or of another preselected pressure thereafter, or the injection plunger stroke upon throughput reduction, and its change up until the reaching of a preselected pressure, or of the pressure before the beginning of throughput reduction, is detected or the amount of the pressure difference between the maximum pressure before and the minimum pressure after throughput reduction is detected and used as a comparison variable for process control.
IPC 1-7
IPC 8 full level
B29C 45/76 (2006.01); B29C 45/77 (2006.01)
CPC (source: EP)
B29C 45/76 (2013.01); B29C 45/77 (2013.01); B29C 2045/776 (2013.01)
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0233548 A2 19870826; EP 0233548 A3 19890208; EP 0233548 B1 19920715; DE 3780322 D1 19920820; ES 2033699 T3 19930401
DOCDB simple family (application)
EP 87101505 A 19870204; DE 3780322 T 19870204; ES 87101505 T 19870204